It depends on your level of education or the grade for which the thesis is to be submitted.
For example in Ph.d level,
you may asked to write a thesis on random behaviour of stock markets and tools to find predictions of som eof teh varaible ( say stock price)
For example in Ph.d level,
you may asked to write a thesis on random behaviour of stock markets and tools to find predictions of som eof teh varaible ( say stock price)